N. Vietnam, Tuyen Quang prov., Na Hang distr., Thanh Tuong municipality, near Ban Bung village (22°16′26′'N, 105°25′58′'E). Primary wet broad-leaved evergreen forest along tops of remnant highly eroded limestone ridge at elev. about 750-800 m a.s.l. Tree 20-25 m hg. Common codominante of 1 forest stratum along tops of ridges.